252184021 has 4 divisors (see below), whose sum is σ = 254415852. Its totient is φ = 249952192.

The previous prime is 252184013. The next prime is 252184033. The reversal of 252184021 is 120481252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76912900 + 175271121 = 8770^2 + 13239^2 .

It is a cyclic number.

It is not a de Polignac number, because 252184021 - 2³ = 252184013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252184091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115746 + ... + 1115971.

It is an arithmetic number, because the mean of its divisors is an integer number (63603963).

Almost surely, 2^252184021 is an apocalyptic number.

It is an amenable number.

252184021 is a deficient number, since it is larger than the sum of its proper divisors (2231831).

252184021 is a wasteful number, since it uses less digits than its factorization.

252184021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231830.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 252184021 is about 15880.3029253223. The cubic root of 252184021 is about 631.7896714050.

The spelling of 252184021 in words is "two hundred fifty-two million, one hundred eighty-four thousand, twenty-one".